Six Seconds is not your typical thriller in that there isn't an degree of suspense as to "who done it." I think every reader knew what was going to happen. What was important in this book was the journey to the climax.
I rather liked the protagonist, the Canadian Mountie, Daniel Graham. In many ways, he was rather cliche: the skilled police detective with a terrible burden, in this case, the loss of his wife in a traffic accident. But even with such characters, it depends on the skill of the author on if that character will come to life. In this case, the author succeeded.
I thought he was a little less successful with Maggie Conlin, the second protagonist. For me, she was a little too hysterical and demonstrative, but there are people like her out there.
One of triggers in the book was the rape of an Iraqi woman and the murder of her husband and son. I think the author was trying to be PC by naming the perpetrators as "mercenaries." In reality, mercenaries were not used in Iraq by coalition forces. There were civilian security contractors, but they did not take the fight to the insurgency. So that would leave the crime to be committed by military forces, something I initially rejected. However, there was a pretty similar case that actually occurred where the perpetrators were US military (with the perpetrators now in prison for life or sentenced to death). So it could have happened. More importantly, it highlights something that I think has been a major issue, the radicalization of people who were either pro-invasion or at worse, ambivalent. To me, this subplot was an extremely important one.
The novel was face-paced and pulled the reader into the storyline. Action was well-written and dialogue realistic. Editing was good with only a few fact-checking-type errors (such as a flight from Maryland to the Washington shore taking three hours or slot machines in Las Vegas still taking coins).
Overall, this was a well-crafted book that was an enjoyable read. I will be reading more of the author's work, and I think that is pretty much the bottom line on most reviews.